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<div class="title">gtest-linked_ptr.h</div>  </div>
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;<span class="comment">// Copyright 2003 Google Inc.</span></div>
<div class="line"><a name="l00002"></a><span class="lineno">    2</span>&#160;<span class="comment">// All rights reserved.</span></div>
<div class="line"><a name="l00003"></a><span class="lineno">    3</span>&#160;<span class="comment">//</span></div>
<div class="line"><a name="l00004"></a><span class="lineno">    4</span>&#160;<span class="comment">// Redistribution and use in source and binary forms, with or without</span></div>
<div class="line"><a name="l00005"></a><span class="lineno">    5</span>&#160;<span class="comment">// modification, are permitted provided that the following conditions are</span></div>
<div class="line"><a name="l00006"></a><span class="lineno">    6</span>&#160;<span class="comment">// met:</span></div>
<div class="line"><a name="l00007"></a><span class="lineno">    7</span>&#160;<span class="comment">//</span></div>
<div class="line"><a name="l00008"></a><span class="lineno">    8</span>&#160;<span class="comment">//     * Redistributions of source code must retain the above copyright</span></div>
<div class="line"><a name="l00009"></a><span class="lineno">    9</span>&#160;<span class="comment">// notice, this list of conditions and the following disclaimer.</span></div>
<div class="line"><a name="l00010"></a><span class="lineno">   10</span>&#160;<span class="comment">//     * Redistributions in binary form must reproduce the above</span></div>
<div class="line"><a name="l00011"></a><span class="lineno">   11</span>&#160;<span class="comment">// copyright notice, this list of conditions and the following disclaimer</span></div>
<div class="line"><a name="l00012"></a><span class="lineno">   12</span>&#160;<span class="comment">// in the documentation and/or other materials provided with the</span></div>
<div class="line"><a name="l00013"></a><span class="lineno">   13</span>&#160;<span class="comment">// distribution.</span></div>
<div class="line"><a name="l00014"></a><span class="lineno">   14</span>&#160;<span class="comment">//     * Neither the name of Google Inc. nor the names of its</span></div>
<div class="line"><a name="l00015"></a><span class="lineno">   15</span>&#160;<span class="comment">// contributors may be used to endorse or promote products derived from</span></div>
<div class="line"><a name="l00016"></a><span class="lineno">   16</span>&#160;<span class="comment">// this software without specific prior written permission.</span></div>
<div class="line"><a name="l00017"></a><span class="lineno">   17</span>&#160;<span class="comment">//</span></div>
<div class="line"><a name="l00018"></a><span class="lineno">   18</span>&#160;<span class="comment">// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS</span></div>
<div class="line"><a name="l00019"></a><span class="lineno">   19</span>&#160;<span class="comment">// &quot;AS IS&quot; AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT</span></div>
<div class="line"><a name="l00020"></a><span class="lineno">   20</span>&#160;<span class="comment">// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR</span></div>
<div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160;<span class="comment">// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT</span></div>
<div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;<span class="comment">// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,</span></div>
<div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;<span class="comment">// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT</span></div>
<div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160;<span class="comment">// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,</span></div>
<div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160;<span class="comment">// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY</span></div>
<div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;<span class="comment">// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT</span></div>
<div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160;<span class="comment">// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE</span></div>
<div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;<span class="comment">// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.</span></div>
<div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;<span class="comment">//</span></div>
<div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;<span class="comment">// Authors: Dan Egnor (egnor@google.com)</span></div>
<div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;<span class="comment">//</span></div>
<div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160;<span class="comment">// A &quot;smart&quot; pointer type with reference tracking.  Every pointer to a</span></div>
<div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160;<span class="comment">// particular object is kept on a circular linked list.  When the last pointer</span></div>
<div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;<span class="comment">// to an object is destroyed or reassigned, the object is deleted.</span></div>
<div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;<span class="comment">//</span></div>
<div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;<span class="comment">// Used properly, this deletes the object when the last reference goes away.</span></div>
<div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;<span class="comment">// There are several caveats:</span></div>
<div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;<span class="comment">// - Like all reference counting schemes, cycles lead to leaks.</span></div>
<div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;<span class="comment">// - Each smart pointer is actually two pointers (8 bytes instead of 4).</span></div>
<div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;<span class="comment">// - Every time a pointer is assigned, the entire list of pointers to that</span></div>
<div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;<span class="comment">//   object is traversed.  This class is therefore NOT SUITABLE when there</span></div>
<div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160;<span class="comment">//   will often be more than two or three pointers to a particular object.</span></div>
<div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;<span class="comment">// - References are only tracked as long as linked_ptr&lt;&gt; objects are copied.</span></div>
<div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;<span class="comment">//   If a linked_ptr&lt;&gt; is converted to a raw pointer and back, BAD THINGS</span></div>
<div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;<span class="comment">//   will happen (double deletion).</span></div>
<div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;<span class="comment">//</span></div>
<div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;<span class="comment">// A good use of this class is storing object references in STL containers.</span></div>
<div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;<span class="comment">// You can safely put linked_ptr&lt;&gt; in a vector&lt;&gt;.</span></div>
<div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;<span class="comment">// Other uses may not be as good.</span></div>
<div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;<span class="comment">//</span></div>
<div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;<span class="comment">// Note: If you use an incomplete type with linked_ptr&lt;&gt;, the class</span></div>
<div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;<span class="comment">// *containing* linked_ptr&lt;&gt; must have a constructor and destructor (even</span></div>
<div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160;<span class="comment">// if they do nothing!).</span></div>
<div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;<span class="comment">//</span></div>
<div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;<span class="comment">// Bill Gibbons suggested we use something like this.</span></div>
<div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160;<span class="comment">//</span></div>
<div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;<span class="comment">// Thread Safety:</span></div>
<div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;<span class="comment">//   Unlike other linked_ptr implementations, in this implementation</span></div>
<div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;<span class="comment">//   a linked_ptr object is thread-safe in the sense that:</span></div>
<div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160;<span class="comment">//     - it&#39;s safe to copy linked_ptr objects concurrently,</span></div>
<div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;<span class="comment">//     - it&#39;s safe to copy *from* a linked_ptr and read its underlying</span></div>
<div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;<span class="comment">//       raw pointer (e.g. via get()) concurrently, and</span></div>
<div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160;<span class="comment">//     - it&#39;s safe to write to two linked_ptrs that point to the same</span></div>
<div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;<span class="comment">//       shared object concurrently.</span></div>
<div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;<span class="comment">// TODO(wan@google.com): rename this to safe_linked_ptr to avoid</span></div>
<div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;<span class="comment">// confusion with normal linked_ptr.</span></div>
<div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;</div>
<div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;<span class="preprocessor">#ifndef GTEST_INCLUDE_GTEST_INTERNAL_GTEST_LINKED_PTR_H_</span></div>
<div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;<span class="preprocessor"></span><span class="preprocessor">#define GTEST_INCLUDE_GTEST_INTERNAL_GTEST_LINKED_PTR_H_</span></div>
<div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;<span class="preprocessor"></span></div>
<div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;<span class="preprocessor">#include &lt;stdlib.h&gt;</span></div>
<div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;<span class="preprocessor">#include &lt;assert.h&gt;</span></div>
<div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160;</div>
<div class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160;<span class="preprocessor">#include &quot;gtest/internal/gtest-port.h&quot;</span></div>
<div class="line"><a name="l00075"></a><span class="lineno">   75</span>&#160;</div>
<div class="line"><a name="l00076"></a><span class="lineno">   76</span>&#160;<span class="keyword">namespace </span>testing {</div>
<div class="line"><a name="l00077"></a><span class="lineno">   77</span>&#160;<span class="keyword">namespace </span>internal {</div>
<div class="line"><a name="l00078"></a><span class="lineno">   78</span>&#160;</div>
<div class="line"><a name="l00079"></a><span class="lineno">   79</span>&#160;<span class="comment">// Protects copying of all linked_ptr objects.</span></div>
<div class="line"><a name="l00080"></a><span class="lineno">   80</span>&#160;GTEST_API_ GTEST_DECLARE_STATIC_MUTEX_(g_linked_ptr_mutex);</div>
<div class="line"><a name="l00081"></a><span class="lineno">   81</span>&#160;</div>
<div class="line"><a name="l00082"></a><span class="lineno">   82</span>&#160;<span class="comment">// This is used internally by all instances of linked_ptr&lt;&gt;.  It needs to be</span></div>
<div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160;<span class="comment">// a non-template class because different types of linked_ptr&lt;&gt; can refer to</span></div>
<div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;<span class="comment">// the same object (linked_ptr&lt;Superclass&gt;(obj) vs linked_ptr&lt;Subclass&gt;(obj)).</span></div>
<div class="line"><a name="l00085"></a><span class="lineno">   85</span>&#160;<span class="comment">// So, it needs to be possible for different types of linked_ptr to participate</span></div>
<div class="line"><a name="l00086"></a><span class="lineno">   86</span>&#160;<span class="comment">// in the same circular linked list, so we need a single class type here.</span></div>
<div class="line"><a name="l00087"></a><span class="lineno">   87</span>&#160;<span class="comment">//</span></div>
<div class="line"><a name="l00088"></a><span class="lineno">   88</span>&#160;<span class="comment">// DO NOT USE THIS CLASS DIRECTLY YOURSELF.  Use linked_ptr&lt;T&gt;.</span></div>
<div class="line"><a name="l00089"></a><span class="lineno"><a class="line" href="classtesting_1_1internal_1_1linked__ptr__internal.html">   89</a></span>&#160;<span class="keyword">class </span><a class="code" href="classtesting_1_1internal_1_1linked__ptr__internal.html">linked_ptr_internal</a> {</div>
<div class="line"><a name="l00090"></a><span class="lineno">   90</span>&#160; <span class="keyword">public</span>:</div>
<div class="line"><a name="l00091"></a><span class="lineno">   91</span>&#160;  <span class="comment">// Create a new circle that includes only this instance.</span></div>
<div class="line"><a name="l00092"></a><span class="lineno">   92</span>&#160;  <span class="keywordtype">void</span> join_new() {</div>
<div class="line"><a name="l00093"></a><span class="lineno">   93</span>&#160;    next_ = <span class="keyword">this</span>;</div>
<div class="line"><a name="l00094"></a><span class="lineno">   94</span>&#160;  }</div>
<div class="line"><a name="l00095"></a><span class="lineno">   95</span>&#160;</div>
<div class="line"><a name="l00096"></a><span class="lineno">   96</span>&#160;  <span class="comment">// Many linked_ptr operations may change p.link_ for some linked_ptr</span></div>
<div class="line"><a name="l00097"></a><span class="lineno">   97</span>&#160;  <span class="comment">// variable p in the same circle as this object.  Therefore we need</span></div>
<div class="line"><a name="l00098"></a><span class="lineno">   98</span>&#160;  <span class="comment">// to prevent two such operations from occurring concurrently.</span></div>
<div class="line"><a name="l00099"></a><span class="lineno">   99</span>&#160;  <span class="comment">//</span></div>
<div class="line"><a name="l00100"></a><span class="lineno">  100</span>&#160;  <span class="comment">// Note that different types of linked_ptr objects can coexist in a</span></div>
<div class="line"><a name="l00101"></a><span class="lineno">  101</span>&#160;  <span class="comment">// circle (e.g. linked_ptr&lt;Base&gt;, linked_ptr&lt;Derived1&gt;, and</span></div>
<div class="line"><a name="l00102"></a><span class="lineno">  102</span>&#160;  <span class="comment">// linked_ptr&lt;Derived2&gt;).  Therefore we must use a single mutex to</span></div>
<div class="line"><a name="l00103"></a><span class="lineno">  103</span>&#160;  <span class="comment">// protect all linked_ptr objects.  This can create serious</span></div>
<div class="line"><a name="l00104"></a><span class="lineno">  104</span>&#160;  <span class="comment">// contention in production code, but is acceptable in a testing</span></div>
<div class="line"><a name="l00105"></a><span class="lineno">  105</span>&#160;  <span class="comment">// framework.</span></div>
<div class="line"><a name="l00106"></a><span class="lineno">  106</span>&#160;</div>
<div class="line"><a name="l00107"></a><span class="lineno">  107</span>&#160;  <span class="comment">// Join an existing circle.</span></div>
<div class="line"><a name="l00108"></a><span class="lineno">  108</span>&#160;  <span class="keywordtype">void</span> join(<a class="code" href="classtesting_1_1internal_1_1linked__ptr__internal.html">linked_ptr_internal</a> <span class="keyword">const</span>* ptr)</div>
<div class="line"><a name="l00109"></a><span class="lineno">  109</span>&#160;      GTEST_LOCK_EXCLUDED_(g_linked_ptr_mutex) {</div>
<div class="line"><a name="l00110"></a><span class="lineno">  110</span>&#160;    <a class="code" href="classtesting_1_1internal_1_1GTestMutexLock.html">MutexLock</a> lock(&amp;g_linked_ptr_mutex);</div>
<div class="line"><a name="l00111"></a><span class="lineno">  111</span>&#160;</div>
<div class="line"><a name="l00112"></a><span class="lineno">  112</span>&#160;    <a class="code" href="classtesting_1_1internal_1_1linked__ptr__internal.html">linked_ptr_internal</a> <span class="keyword">const</span>* p = ptr;</div>
<div class="line"><a name="l00113"></a><span class="lineno">  113</span>&#160;    <span class="keywordflow">while</span> (p-&gt;next_ != ptr) {</div>
<div class="line"><a name="l00114"></a><span class="lineno">  114</span>&#160;      assert(p-&gt;next_ != <span class="keyword">this</span> &amp;&amp;</div>
<div class="line"><a name="l00115"></a><span class="lineno">  115</span>&#160;             <span class="stringliteral">&quot;Trying to join() a linked ring we are already in. &quot;</span></div>
<div class="line"><a name="l00116"></a><span class="lineno">  116</span>&#160;             <span class="stringliteral">&quot;Is GMock thread safety enabled?&quot;</span>);</div>
<div class="line"><a name="l00117"></a><span class="lineno">  117</span>&#160;      p = p-&gt;next_;</div>
<div class="line"><a name="l00118"></a><span class="lineno">  118</span>&#160;    }</div>
<div class="line"><a name="l00119"></a><span class="lineno">  119</span>&#160;    p-&gt;next_ = <span class="keyword">this</span>;</div>
<div class="line"><a name="l00120"></a><span class="lineno">  120</span>&#160;    next_ = ptr;</div>
<div class="line"><a name="l00121"></a><span class="lineno">  121</span>&#160;  }</div>
<div class="line"><a name="l00122"></a><span class="lineno">  122</span>&#160;</div>
<div class="line"><a name="l00123"></a><span class="lineno">  123</span>&#160;  <span class="comment">// Leave whatever circle we&#39;re part of.  Returns true if we were the</span></div>
<div class="line"><a name="l00124"></a><span class="lineno">  124</span>&#160;  <span class="comment">// last member of the circle.  Once this is done, you can join() another.</span></div>
<div class="line"><a name="l00125"></a><span class="lineno">  125</span>&#160;  <span class="keywordtype">bool</span> depart()</div>
<div class="line"><a name="l00126"></a><span class="lineno">  126</span>&#160;      GTEST_LOCK_EXCLUDED_(g_linked_ptr_mutex) {</div>
<div class="line"><a name="l00127"></a><span class="lineno">  127</span>&#160;    <a class="code" href="classtesting_1_1internal_1_1GTestMutexLock.html">MutexLock</a> lock(&amp;g_linked_ptr_mutex);</div>
<div class="line"><a name="l00128"></a><span class="lineno">  128</span>&#160;</div>
<div class="line"><a name="l00129"></a><span class="lineno">  129</span>&#160;    <span class="keywordflow">if</span> (next_ == <span class="keyword">this</span>) <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
<div class="line"><a name="l00130"></a><span class="lineno">  130</span>&#160;    <a class="code" href="classtesting_1_1internal_1_1linked__ptr__internal.html">linked_ptr_internal</a> <span class="keyword">const</span>* p = next_;</div>
<div class="line"><a name="l00131"></a><span class="lineno">  131</span>&#160;    <span class="keywordflow">while</span> (p-&gt;next_ != <span class="keyword">this</span>) {</div>
<div class="line"><a name="l00132"></a><span class="lineno">  132</span>&#160;      assert(p-&gt;next_ != next_ &amp;&amp;</div>
<div class="line"><a name="l00133"></a><span class="lineno">  133</span>&#160;             <span class="stringliteral">&quot;Trying to depart() a linked ring we are not in. &quot;</span></div>
<div class="line"><a name="l00134"></a><span class="lineno">  134</span>&#160;             <span class="stringliteral">&quot;Is GMock thread safety enabled?&quot;</span>);</div>
<div class="line"><a name="l00135"></a><span class="lineno">  135</span>&#160;      p = p-&gt;next_;</div>
<div class="line"><a name="l00136"></a><span class="lineno">  136</span>&#160;    }</div>
<div class="line"><a name="l00137"></a><span class="lineno">  137</span>&#160;    p-&gt;next_ = next_;</div>
<div class="line"><a name="l00138"></a><span class="lineno">  138</span>&#160;    <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
<div class="line"><a name="l00139"></a><span class="lineno">  139</span>&#160;  }</div>
<div class="line"><a name="l00140"></a><span class="lineno">  140</span>&#160;</div>
<div class="line"><a name="l00141"></a><span class="lineno">  141</span>&#160; <span class="keyword">private</span>:</div>
<div class="line"><a name="l00142"></a><span class="lineno">  142</span>&#160;  <span class="keyword">mutable</span> <a class="code" href="classtesting_1_1internal_1_1linked__ptr__internal.html">linked_ptr_internal</a> <span class="keyword">const</span>* next_;</div>
<div class="line"><a name="l00143"></a><span class="lineno">  143</span>&#160;};</div>
<div class="line"><a name="l00144"></a><span class="lineno">  144</span>&#160;</div>
<div class="line"><a name="l00145"></a><span class="lineno">  145</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt;</div>
<div class="line"><a name="l00146"></a><span class="lineno"><a class="line" href="classtesting_1_1internal_1_1linked__ptr.html">  146</a></span>&#160;<span class="keyword">class </span><a class="code" href="classtesting_1_1internal_1_1linked__ptr.html">linked_ptr</a> {</div>
<div class="line"><a name="l00147"></a><span class="lineno">  147</span>&#160; <span class="keyword">public</span>:</div>
<div class="line"><a name="l00148"></a><span class="lineno">  148</span>&#160;  <span class="keyword">typedef</span> T element_type;</div>
<div class="line"><a name="l00149"></a><span class="lineno">  149</span>&#160;</div>
<div class="line"><a name="l00150"></a><span class="lineno">  150</span>&#160;  <span class="comment">// Take over ownership of a raw pointer.  This should happen as soon as</span></div>
<div class="line"><a name="l00151"></a><span class="lineno">  151</span>&#160;  <span class="comment">// possible after the object is created.</span></div>
<div class="line"><a name="l00152"></a><span class="lineno">  152</span>&#160;  <span class="keyword">explicit</span> <a class="code" href="classtesting_1_1internal_1_1linked__ptr.html">linked_ptr</a>(T* ptr = NULL) { capture(ptr); }</div>
<div class="line"><a name="l00153"></a><span class="lineno">  153</span>&#160;  ~<a class="code" href="classtesting_1_1internal_1_1linked__ptr.html">linked_ptr</a>() { depart(); }</div>
<div class="line"><a name="l00154"></a><span class="lineno">  154</span>&#160;</div>
<div class="line"><a name="l00155"></a><span class="lineno">  155</span>&#160;  <span class="comment">// Copy an existing linked_ptr&lt;&gt;, adding ourselves to the list of references.</span></div>
<div class="line"><a name="l00156"></a><span class="lineno">  156</span>&#160;  <span class="keyword">template</span> &lt;<span class="keyword">typename</span> U&gt; <a class="code" href="classtesting_1_1internal_1_1linked__ptr.html">linked_ptr</a>(<a class="code" href="classtesting_1_1internal_1_1linked__ptr.html">linked_ptr&lt;U&gt;</a> <span class="keyword">const</span>&amp; ptr) { copy(&amp;ptr); }</div>
<div class="line"><a name="l00157"></a><span class="lineno">  157</span>&#160;  <a class="code" href="classtesting_1_1internal_1_1linked__ptr.html">linked_ptr</a>(<a class="code" href="classtesting_1_1internal_1_1linked__ptr.html">linked_ptr</a> <span class="keyword">const</span>&amp; ptr) {  <span class="comment">// NOLINT</span></div>
<div class="line"><a name="l00158"></a><span class="lineno">  158</span>&#160;    assert(&amp;ptr != <span class="keyword">this</span>);</div>
<div class="line"><a name="l00159"></a><span class="lineno">  159</span>&#160;    copy(&amp;ptr);</div>
<div class="line"><a name="l00160"></a><span class="lineno">  160</span>&#160;  }</div>
<div class="line"><a name="l00161"></a><span class="lineno">  161</span>&#160;</div>
<div class="line"><a name="l00162"></a><span class="lineno">  162</span>&#160;  <span class="comment">// Assignment releases the old value and acquires the new.</span></div>
<div class="line"><a name="l00163"></a><span class="lineno">  163</span>&#160;  <span class="keyword">template</span> &lt;<span class="keyword">typename</span> U&gt; <a class="code" href="classtesting_1_1internal_1_1linked__ptr.html">linked_ptr</a>&amp; operator=(<a class="code" href="classtesting_1_1internal_1_1linked__ptr.html">linked_ptr&lt;U&gt;</a> <span class="keyword">const</span>&amp; ptr) {</div>
<div class="line"><a name="l00164"></a><span class="lineno">  164</span>&#160;    depart();</div>
<div class="line"><a name="l00165"></a><span class="lineno">  165</span>&#160;    copy(&amp;ptr);</div>
<div class="line"><a name="l00166"></a><span class="lineno">  166</span>&#160;    <span class="keywordflow">return</span> *<span class="keyword">this</span>;</div>
<div class="line"><a name="l00167"></a><span class="lineno">  167</span>&#160;  }</div>
<div class="line"><a name="l00168"></a><span class="lineno">  168</span>&#160;</div>
<div class="line"><a name="l00169"></a><span class="lineno">  169</span>&#160;  <a class="code" href="classtesting_1_1internal_1_1linked__ptr.html">linked_ptr</a>&amp; operator=(<a class="code" href="classtesting_1_1internal_1_1linked__ptr.html">linked_ptr</a> <span class="keyword">const</span>&amp; ptr) {</div>
<div class="line"><a name="l00170"></a><span class="lineno">  170</span>&#160;    <span class="keywordflow">if</span> (&amp;ptr != <span class="keyword">this</span>) {</div>
<div class="line"><a name="l00171"></a><span class="lineno">  171</span>&#160;      depart();</div>
<div class="line"><a name="l00172"></a><span class="lineno">  172</span>&#160;      copy(&amp;ptr);</div>
<div class="line"><a name="l00173"></a><span class="lineno">  173</span>&#160;    }</div>
<div class="line"><a name="l00174"></a><span class="lineno">  174</span>&#160;    <span class="keywordflow">return</span> *<span class="keyword">this</span>;</div>
<div class="line"><a name="l00175"></a><span class="lineno">  175</span>&#160;  }</div>
<div class="line"><a name="l00176"></a><span class="lineno">  176</span>&#160;</div>
<div class="line"><a name="l00177"></a><span class="lineno">  177</span>&#160;  <span class="comment">// Smart pointer members.</span></div>
<div class="line"><a name="l00178"></a><span class="lineno">  178</span>&#160;  <span class="keywordtype">void</span> reset(T* ptr = NULL) {</div>
<div class="line"><a name="l00179"></a><span class="lineno">  179</span>&#160;    depart();</div>
<div class="line"><a name="l00180"></a><span class="lineno">  180</span>&#160;    capture(ptr);</div>
<div class="line"><a name="l00181"></a><span class="lineno">  181</span>&#160;  }</div>
<div class="line"><a name="l00182"></a><span class="lineno">  182</span>&#160;  T* <span class="keyword">get</span>() <span class="keyword">const</span> { <span class="keywordflow">return</span> value_; }</div>
<div class="line"><a name="l00183"></a><span class="lineno">  183</span>&#160;  T* operator-&gt;()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> value_; }</div>
<div class="line"><a name="l00184"></a><span class="lineno">  184</span>&#160;  T&amp; operator*()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> *value_; }</div>
<div class="line"><a name="l00185"></a><span class="lineno">  185</span>&#160;</div>
<div class="line"><a name="l00186"></a><span class="lineno">  186</span>&#160;  <span class="keywordtype">bool</span> operator==(T* p)<span class="keyword"> const </span>{ <span class="keywordflow">return</span> value_ == p; }</div>
<div class="line"><a name="l00187"></a><span class="lineno">  187</span>&#160;  <span class="keywordtype">bool</span> operator!=(T* p)<span class="keyword"> const </span>{ <span class="keywordflow">return</span> value_ != p; }</div>
<div class="line"><a name="l00188"></a><span class="lineno">  188</span>&#160;  <span class="keyword">template</span> &lt;<span class="keyword">typename</span> U&gt;</div>
<div class="line"><a name="l00189"></a><span class="lineno">  189</span>&#160;  <span class="keywordtype">bool</span> operator==(<a class="code" href="classtesting_1_1internal_1_1linked__ptr.html">linked_ptr&lt;U&gt;</a> <span class="keyword">const</span>&amp; ptr)<span class="keyword"> const </span>{</div>
<div class="line"><a name="l00190"></a><span class="lineno">  190</span>&#160;    <span class="keywordflow">return</span> value_ == ptr.get();</div>
<div class="line"><a name="l00191"></a><span class="lineno">  191</span>&#160;  }</div>
<div class="line"><a name="l00192"></a><span class="lineno">  192</span>&#160;  <span class="keyword">template</span> &lt;<span class="keyword">typename</span> U&gt;</div>
<div class="line"><a name="l00193"></a><span class="lineno">  193</span>&#160;  <span class="keywordtype">bool</span> operator!=(<a class="code" href="classtesting_1_1internal_1_1linked__ptr.html">linked_ptr&lt;U&gt;</a> <span class="keyword">const</span>&amp; ptr)<span class="keyword"> const </span>{</div>
<div class="line"><a name="l00194"></a><span class="lineno">  194</span>&#160;    <span class="keywordflow">return</span> value_ != ptr.get();</div>
<div class="line"><a name="l00195"></a><span class="lineno">  195</span>&#160;  }</div>
<div class="line"><a name="l00196"></a><span class="lineno">  196</span>&#160;</div>
<div class="line"><a name="l00197"></a><span class="lineno">  197</span>&#160; <span class="keyword">private</span>:</div>
<div class="line"><a name="l00198"></a><span class="lineno">  198</span>&#160;  <span class="keyword">template</span> &lt;<span class="keyword">typename</span> U&gt;</div>
<div class="line"><a name="l00199"></a><span class="lineno">  199</span>&#160;  <span class="keyword">friend</span> <span class="keyword">class </span><a class="code" href="classtesting_1_1internal_1_1linked__ptr.html">linked_ptr</a>;</div>
<div class="line"><a name="l00200"></a><span class="lineno">  200</span>&#160;</div>
<div class="line"><a name="l00201"></a><span class="lineno">  201</span>&#160;  T* value_;</div>
<div class="line"><a name="l00202"></a><span class="lineno">  202</span>&#160;  <a class="code" href="classtesting_1_1internal_1_1linked__ptr__internal.html">linked_ptr_internal</a> link_;</div>
<div class="line"><a name="l00203"></a><span class="lineno">  203</span>&#160;</div>
<div class="line"><a name="l00204"></a><span class="lineno">  204</span>&#160;  <span class="keywordtype">void</span> depart() {</div>
<div class="line"><a name="l00205"></a><span class="lineno">  205</span>&#160;    <span class="keywordflow">if</span> (link_.depart()) <span class="keyword">delete</span> value_;</div>
<div class="line"><a name="l00206"></a><span class="lineno">  206</span>&#160;  }</div>
<div class="line"><a name="l00207"></a><span class="lineno">  207</span>&#160;</div>
<div class="line"><a name="l00208"></a><span class="lineno">  208</span>&#160;  <span class="keywordtype">void</span> capture(T* ptr) {</div>
<div class="line"><a name="l00209"></a><span class="lineno">  209</span>&#160;    value_ = ptr;</div>
<div class="line"><a name="l00210"></a><span class="lineno">  210</span>&#160;    link_.join_new();</div>
<div class="line"><a name="l00211"></a><span class="lineno">  211</span>&#160;  }</div>
<div class="line"><a name="l00212"></a><span class="lineno">  212</span>&#160;</div>
<div class="line"><a name="l00213"></a><span class="lineno">  213</span>&#160;  <span class="keyword">template</span> &lt;<span class="keyword">typename</span> U&gt; <span class="keywordtype">void</span> copy(<a class="code" href="classtesting_1_1internal_1_1linked__ptr.html">linked_ptr&lt;U&gt;</a> <span class="keyword">const</span>* ptr) {</div>
<div class="line"><a name="l00214"></a><span class="lineno">  214</span>&#160;    value_ = ptr-&gt;get();</div>
<div class="line"><a name="l00215"></a><span class="lineno">  215</span>&#160;    <span class="keywordflow">if</span> (value_)</div>
<div class="line"><a name="l00216"></a><span class="lineno">  216</span>&#160;      link_.join(&amp;ptr-&gt;link_);</div>
<div class="line"><a name="l00217"></a><span class="lineno">  217</span>&#160;    <span class="keywordflow">else</span></div>
<div class="line"><a name="l00218"></a><span class="lineno">  218</span>&#160;      link_.join_new();</div>
<div class="line"><a name="l00219"></a><span class="lineno">  219</span>&#160;  }</div>
<div class="line"><a name="l00220"></a><span class="lineno">  220</span>&#160;};</div>
<div class="line"><a name="l00221"></a><span class="lineno">  221</span>&#160;</div>
<div class="line"><a name="l00222"></a><span class="lineno">  222</span>&#160;<span class="keyword">template</span>&lt;<span class="keyword">typename</span> T&gt; <span class="keyword">inline</span></div>
<div class="line"><a name="l00223"></a><span class="lineno">  223</span>&#160;<span class="keywordtype">bool</span> operator==(T* ptr, <span class="keyword">const</span> <a class="code" href="classtesting_1_1internal_1_1linked__ptr.html">linked_ptr&lt;T&gt;</a>&amp; x) {</div>
<div class="line"><a name="l00224"></a><span class="lineno">  224</span>&#160;  <span class="keywordflow">return</span> ptr == x.get();</div>
<div class="line"><a name="l00225"></a><span class="lineno">  225</span>&#160;}</div>
<div class="line"><a name="l00226"></a><span class="lineno">  226</span>&#160;</div>
<div class="line"><a name="l00227"></a><span class="lineno">  227</span>&#160;<span class="keyword">template</span>&lt;<span class="keyword">typename</span> T&gt; <span class="keyword">inline</span></div>
<div class="line"><a name="l00228"></a><span class="lineno">  228</span>&#160;<span class="keywordtype">bool</span> operator!=(T* ptr, <span class="keyword">const</span> linked_ptr&lt;T&gt;&amp; x) {</div>
<div class="line"><a name="l00229"></a><span class="lineno">  229</span>&#160;  <span class="keywordflow">return</span> ptr != x.get();</div>
<div class="line"><a name="l00230"></a><span class="lineno">  230</span>&#160;}</div>
<div class="line"><a name="l00231"></a><span class="lineno">  231</span>&#160;</div>
<div class="line"><a name="l00232"></a><span class="lineno">  232</span>&#160;<span class="comment">// A function to convert T* into linked_ptr&lt;T&gt;</span></div>
<div class="line"><a name="l00233"></a><span class="lineno">  233</span>&#160;<span class="comment">// Doing e.g. make_linked_ptr(new FooBarBaz&lt;type&gt;(arg)) is a shorter notation</span></div>
<div class="line"><a name="l00234"></a><span class="lineno">  234</span>&#160;<span class="comment">// for linked_ptr&lt;FooBarBaz&lt;type&gt; &gt;(new FooBarBaz&lt;type&gt;(arg))</span></div>
<div class="line"><a name="l00235"></a><span class="lineno">  235</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt;</div>
<div class="line"><a name="l00236"></a><span class="lineno">  236</span>&#160;linked_ptr&lt;T&gt; make_linked_ptr(T* ptr) {</div>
<div class="line"><a name="l00237"></a><span class="lineno">  237</span>&#160;  <span class="keywordflow">return</span> linked_ptr&lt;T&gt;(ptr);</div>
<div class="line"><a name="l00238"></a><span class="lineno">  238</span>&#160;}</div>
<div class="line"><a name="l00239"></a><span class="lineno">  239</span>&#160;</div>
<div class="line"><a name="l00240"></a><span class="lineno">  240</span>&#160;}  <span class="comment">// namespace internal</span></div>
<div class="line"><a name="l00241"></a><span class="lineno">  241</span>&#160;}  <span class="comment">// namespace testing</span></div>
<div class="line"><a name="l00242"></a><span class="lineno">  242</span>&#160;</div>
<div class="line"><a name="l00243"></a><span class="lineno">  243</span>&#160;<span class="preprocessor">#endif  // GTEST_INCLUDE_GTEST_INTERNAL_GTEST_LINKED_PTR_H_</span></div>
<div class="ttc" id="classtesting_1_1internal_1_1linked__ptr_html"><div class="ttname"><a href="classtesting_1_1internal_1_1linked__ptr.html">testing::internal::linked_ptr</a></div><div class="ttdef"><b>Definition:</b> <a href="gtest-linked__ptr_8h_source.html#l00146">gtest-linked_ptr.h:146</a></div></div>
<div class="ttc" id="classtesting_1_1internal_1_1GTestMutexLock_html"><div class="ttname"><a href="classtesting_1_1internal_1_1GTestMutexLock.html">testing::internal::GTestMutexLock</a></div><div class="ttdef"><b>Definition:</b> <a href="gtest-port_8h_source.html#l02154">gtest-port.h:2154</a></div></div>
<div class="ttc" id="classtesting_1_1internal_1_1linked__ptr__internal_html"><div class="ttname"><a href="classtesting_1_1internal_1_1linked__ptr__internal.html">testing::internal::linked_ptr_internal</a></div><div class="ttdef"><b>Definition:</b> <a href="gtest-linked__ptr_8h_source.html#l00089">gtest-linked_ptr.h:89</a></div></div>
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